$ git clone -n https://src.fedoraproject.org/rpms/rubiks.git /var/lib/mock/f40-build-2259406-54370/root/chroot_tmpdir/scmroot/rubiks
Cloning into '/var/lib/mock/f40-build-2259406-54370/root/chroot_tmpdir/scmroot/rubiks'...
$ git fetch origin 7b6f754ddf7caa74796fad9c8054a0db398de00f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubiks
 * [new ref]         7b6f754ddf7caa74796fad9c8054a0db398de00f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b6f754 Stop building for 32-bit x86